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Learning to describe problems is hard, but it is an important part of learning how to code.
Also, the more you say, the more we can help!
All you need to do then is change the text ‘Hello World’ to ‘CatPhotoApp’, without modifying any other code. Note that the text is case-sensitive, so needs to be exactly correct.
Note: as mentioned, all of the lessons are case sensitive, and also sensitive to symbols, spacing, etc. If you receive an error, I would make sure all letters and symbols are in the right spots before going too crazy trying to find the error.